ASoC: tegra: Add Tegra210 based Mixer driver

The Mixer supports mixing of up to ten 7.1 audio input streams and
generate five outputs (each of which can be any combination of the
ten input streams)

This patch registers Mixer driver with ASoC framework. The component
driver exposes DAPM widgets, routes and kcontrols for the device.
The DAI driver exposes Mixer interfaces, which can be used to connect
different components in the ASoC layer. Makefile and Kconfig support
is added to allow build the driver. It can be enabled in the DT via
"nvidia,tegra210-amixer" compatible binding.
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1631551342-25469-11-git-send-email-spujar@nvidia.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/Kconfig

@@ -146,6 +146,16 @@ config SND_SOC_TEGRA210_ADX
 	  except that the data flow direction is reversed.
 	  Say Y or M if you want to add support for Tegra210 ADX module.
 
+config SND_SOC_TEGRA210_MIXER
+	tristate "Tegra210 Mixer module"
+	help
+	  Config to enable the Mixer module which can help to mix multiple
+	  audio streams. It supports mixing of upto 10 input streams,
+	  where each stream can contain maximum of 8 channels. It supports
+	  5 output each of which can be a mix of any combination of 10
+	  input streams.
+	  Say Y or M if you want to add support for Tegra210 Mixer module.
+
 config SND_SOC_TEGRA_AUDIO_GRAPH_CARD
 	tristate "Audio Graph Card based Tegra driver"
 	depends on SND_AUDIO_GRAPH_CARD

sound/soc/tegra/Makefile

@@ -17,6 +17,7 @@ snd-soc-tegra210-mvc-objs := tegra210_mvc.o
 snd-soc-tegra210-sfc-objs := tegra210_sfc.o
 snd-soc-tegra210-amx-objs := tegra210_amx.o
 snd-soc-tegra210-adx-objs := tegra210_adx.o
+snd-soc-tegra210-mixer-objs := tegra210_mixer.o
 
 obj-$(CONFIG_SND_SOC_TEGRA) += snd-soc-tegra-pcm.o
 obj-$(CONFIG_SND_SOC_TEGRA20_AC97) += snd-soc-tegra20-ac97.o
@@ -34,6 +35,7 @@ obj-$(CONFIG_SND_SOC_TEGRA210_MVC) += snd-soc-tegra210-mvc.o
 obj-$(CONFIG_SND_SOC_TEGRA210_SFC) += snd-soc-tegra210-sfc.o
 obj-$(CONFIG_SND_SOC_TEGRA210_AMX) += snd-soc-tegra210-amx.o
 obj-$(CONFIG_SND_SOC_TEGRA210_ADX) += snd-soc-tegra210-adx.o
+obj-$(CONFIG_SND_SOC_TEGRA210_MIXER) += snd-soc-tegra210-mixer.o
 
 # Tegra machine Support
 snd-soc-tegra-wm8903-objs := tegra_wm8903.o

sound/soc/tegra/tegra210_mixer.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * tegra210_mixer.h - Definitions for Tegra210 MIXER driver
+ *
+ * Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
+ *
+ */
+
+#ifndef __TEGRA210_MIXER_H__
+#define __TEGRA210_MIXER_H__
+
+/* XBAR_RX related MIXER offsets */
+#define TEGRA210_MIXER_RX1_SOFT_RESET	0x04
+#define TEGRA210_MIXER_RX1_STATUS	0x10
+#define TEGRA210_MIXER_RX1_CIF_CTRL	0x24
+#define TEGRA210_MIXER_RX1_CTRL		0x28
+#define TEGRA210_MIXER_RX1_PEAK_CTRL	0x2c
+#define TEGRA210_MIXER_RX1_SAMPLE_COUNT	0x30
+
+/* XBAR_TX related MIXER offsets */
+#define TEGRA210_MIXER_TX1_ENABLE	0x280
+#define TEGRA210_MIXER_TX1_SOFT_RESET	0x284
+#define TEGRA210_MIXER_TX1_STATUS	0x290
+#define TEGRA210_MIXER_TX1_INT_STATUS	0x294
+#define TEGRA210_MIXER_TX1_INT_MASK	0x298
+#define TEGRA210_MIXER_TX1_INT_SET	0x29c
+#define TEGRA210_MIXER_TX1_INT_CLEAR	0x2a0
+#define TEGRA210_MIXER_TX1_CIF_CTRL	0x2a4
+#define TEGRA210_MIXER_TX1_ADDER_CONFIG	0x2a8
+
+/* MIXER related offsets */
+#define TEGRA210_MIXER_ENABLE			0x400
+#define TEGRA210_MIXER_SOFT_RESET		0x404
+#define TEGRA210_MIXER_CG			0x408
+#define TEGRA210_MIXER_STATUS			0x410
+#define TEGRA210_MIXER_INT_STATUS		0x414
+#define TEGRA210_MIXER_GAIN_CFG_RAM_CTRL	0x42c
+#define TEGRA210_MIXER_GAIN_CFG_RAM_DATA	0x430
+#define TEGRA210_MIXER_PEAKM_RAM_CTRL		0x434
+#define TEGRA210_MIXER_PEAKM_RAM_DATA		0x438
+#define TEGRA210_MIXER_CTRL			0x43c
+
+#define TEGRA210_MIXER_TX2_ADDER_CONFIG	(TEGRA210_MIXER_TX1_ADDER_CONFIG + TEGRA210_MIXER_REG_STRIDE)
+#define TEGRA210_MIXER_TX3_ADDER_CONFIG	(TEGRA210_MIXER_TX2_ADDER_CONFIG + TEGRA210_MIXER_REG_STRIDE)
+#define TEGRA210_MIXER_TX4_ADDER_CONFIG	(TEGRA210_MIXER_TX3_ADDER_CONFIG + TEGRA210_MIXER_REG_STRIDE)
+#define TEGRA210_MIXER_TX5_ADDER_CONFIG	(TEGRA210_MIXER_TX4_ADDER_CONFIG + TEGRA210_MIXER_REG_STRIDE)
+
+#define TEGRA210_MIXER_TX2_ENABLE	(TEGRA210_MIXER_TX1_ENABLE + TEGRA210_MIXER_REG_STRIDE)
+#define TEGRA210_MIXER_TX3_ENABLE	(TEGRA210_MIXER_TX2_ENABLE + TEGRA210_MIXER_REG_STRIDE)
+#define TEGRA210_MIXER_TX4_ENABLE	(TEGRA210_MIXER_TX3_ENABLE + TEGRA210_MIXER_REG_STRIDE)
+#define TEGRA210_MIXER_TX5_ENABLE	(TEGRA210_MIXER_TX4_ENABLE + TEGRA210_MIXER_REG_STRIDE)
+
+/* Fields in TEGRA210_MIXER_ENABLE */
+#define TEGRA210_MIXER_ENABLE_SHIFT	0
+#define TEGRA210_MIXER_ENABLE_MASK	(1 << TEGRA210_MIXER_ENABLE_SHIFT)
+#define TEGRA210_MIXER_EN		(1 << TEGRA210_MIXER_ENABLE_SHIFT)
+
+/* Fields in TEGRA210_MIXER_GAIN_CFG_RAM_CTRL */
+#define TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_0		0x0
+#define TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_STRIDE		0x10
+
+#define TEGRA210_MIXER_GAIN_CFG_RAM_RW_SHIFT		14
+#define TEGRA210_MIXER_GAIN_CFG_RAM_RW_MASK		(1 << TEGRA210_MIXER_GAIN_CFG_RAM_RW_SHIFT)
+#define TEGRA210_MIXER_GAIN_CFG_RAM_RW_WRITE		(1 << TEGRA210_MIXER_GAIN_CFG_RAM_RW_SHIFT)
+
+#define TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_INIT_EN_SHIFT	13
+#define TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_INIT_EN_MASK	(1 << TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_INIT_EN_SHIFT)
+#define TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_INIT_EN	(1 << TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_INIT_EN_SHIFT)
+
+#define TEGRA210_MIXER_GAIN_CFG_RAM_SEQ_ACCESS_EN_SHIFT	12
+#define TEGRA210_MIXER_GAIN_CFG_RAM_SEQ_ACCESS_EN_MASK	(1 << TEGRA210_MIXER_GAIN_CFG_RAM_SEQ_ACCESS_EN_SHIFT)
+#define TEGRA210_MIXER_GAIN_CFG_RAM_SEQ_ACCESS_EN	(1 << TEGRA210_MIXER_GAIN_CFG_RAM_SEQ_ACCESS_EN_SHIFT)
+
+#define TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_SHIFT		0
+#define TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_MASK		(0x1ff << TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_SHIFT)
+
+#define TEGRA210_MIXER_REG_STRIDE	0x40
+#define TEGRA210_MIXER_RX_MAX		10
+#define TEGRA210_MIXER_RX_LIMIT		(TEGRA210_MIXER_RX_MAX * TEGRA210_MIXER_REG_STRIDE)
+#define TEGRA210_MIXER_TX_MAX		5
+#define TEGRA210_MIXER_TX_LIMIT		(TEGRA210_MIXER_RX_LIMIT + (TEGRA210_MIXER_TX_MAX * TEGRA210_MIXER_REG_STRIDE))
+
+#define REG_CFG_DONE_TRIGGER	0xf
+#define VAL_CFG_DONE_TRIGGER	0x1
+
+#define NUM_GAIN_POLY_COEFFS 9
+#define NUM_DURATION_PARMS 4
+
+struct tegra210_mixer_gain_params {
+	int poly_coeff[NUM_GAIN_POLY_COEFFS];
+	int gain_value;
+	int duration[NUM_DURATION_PARMS];
+};
+
+struct tegra210_mixer {
+	int gain_value[TEGRA210_MIXER_RX_MAX];
+	struct regmap *regmap;
+};
+
+#endif